It is the title character and the main antagonist in Stephen King’s 1986 horror novel It. The character is an ancient, trans-dimensional evil entity which preys upon the children (and sometimes adults) of Derry, Maine, roughly every 27 years, using a variety of powers that include the ability to shapeshift, manipulate reality, and go unnoticed by adults. During the course of the story, It primarily appears in the form of Pennywise the Dancing Clown.